Machine for making tubular tool-shanks.



No. 706,5l3. 4 PafentuAug. l2, |902.

F. P. BATES.

MACHINE FOR MAKING TUBULAR TOOL SHANKS.

(Application` fled- Apt. 3, 1901.)

(No Model.)

l OHNEY AUNITED STATES PATENT OFFICE.

FRANKLIN P. BATES, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO 'I'IIE IN- DIANAPOLIS DROP FORGING COMPANY, OF INDIANAPOLIS, INDIANA,

A CORPORATION OF INDIANA.

MACHINE FOR MAKlNe TUBULAR TQoL-SHANKS.

SPECIFICATION forming part of Letters Patent No. 7O,5173, dated August 12, 1902.

lApplication filed April 3, 1901.

To all whom it may concern:

Be it known that LFEANKLIN P. BATES, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Machines for Making Tubular Tool-Shanks, of which the following is a specification.

Heretofore in the manufacture of tubular shanks for tools-such as hoes, shovels, chisels, and the like-the metal from which the shank is made has generally been plated out and its edges brought around and welded together, forming the tubular shank for the handle of the tool. Inwork of this character under the conditions which usually prevail where it is carried on thereisa considerable loss in the vproduct by reason of defective welding and otherwise, while the eXpenseof doing the work is considerable.

It is the object of my invention to produce a machine by means of which a tubular toolshank can be produced from the solid, and the tool itself, or so much thereof as may be desired, afterward formed from the saine metal. The machine WhichI have designed for doing this work is in4 general form a punch-press, wherein the ordinaryldies,` arereplaced-.by a round punching-dieof,considerable length, forming a mandrelA upon which the shank is rolled and a series of revolubledie parts secured to the bed of the pressand adapted to roll the metal up around saidpunch or mandrel die in performing the operation. f Suitable strippers are incorporated in this machine by means of which the shank when rolledis stripped ed the punch ormandrel. The press itself, as above stated, is substantially of the ordinary form.; but its stroke for this work is generally longerthan'is common in such presses, for the reason that such Shanks are generallyrequired to'be longer than the ordinary stroke of a common press.

Referring tothe accompanying drawings, which are made a part hereof, and on which similar reference characters indicate similar parts, Figure 1 is a perspective View of a press or machine provided with dies and appliances suitable to the carrying out of my invention;

Fig. 2, a top or plan view of the lower dios or serial no. 54,113. (No mau.)

formers; lFig. 3, a fragmentary view, partially in side elevation and partially in central vertical section, illustrating the arrangement of the dies; and Fig. 4, a detail sectional view similar to a portion of Fig. 3, but on a larger scale, showing one of the revoluble die parts,

its housing, and the immediately adjacent:y

moves in the usual guideways 7 on the columns 3. Secured to thisplunger inthe ordinary manner of securing upper dies is the punch ormandrel S.

Secured upon the bolster 2 is a die-framel, and in` this die-frame are secured the adjustable die-part housings, carrying the revoluble die `parts 11. These housings l0 are secured to the die-frame 9by bolts 12,' passing through i suitable slots,and are adapted to be accurately adjusted toV position by means of screw-followers 13, mounted `inears 14 on the die-.e`

frame 9. 1

The revoluble die parts 11 are in the form of rollers with concave faces, and avset of theserollers when the 4'same are vbrought into opn `erative relation form a circular external die,

the operative face of which isadapted to travel over the surface of the shank being made. In the drawings I have shown this die as composed of four of these revoluble die parts; but manifestly any desired number within the limits of practicability may be employed, and especially inthe case of large shanks I should expect to use alarger number, preferably six. These revoluble die parts :have axles l5, which are mounted in the housings 10.

In operation a round piece of Solid metal of a diameter'somewhat greater than the diameter of the opening between the peripheries of the rollers is taken and a slight depression formed in one end, which is adapted to receive the point of the upper die or mam IOC) drel 8. In operation as this die or mandrel descends and forces the metal between the die parts 11 the latter operate to roll so much of the metal as lies outside of a central core equal in diameter to the opening between the rollers or revoluble die parts up around said die or mandrel, forming a continuous and seamless tube from aportion of the metal, and thus constituting the hollow shank, while the central core of the metal passes on down through and forms a body extending down from'the end of the structure. The surplus or external portion of the bar is thus shoved up above the original upper end, which is engaged by the mandrel. Said central core or body may be afterward forged into any shape desired, and'in many cases may be forged into the complete tool or tool-plate, thus producing an entire tool from a solid piece of round metal.

At some suitable point strippers are to be provided, by means of which the shank will be stripped oi the die or mandrel 8 as the same is drawn out on the upward stroke of the machine. These may be conveniently provided by forming suitable chambers in the under side of the die-frame 9 and inserting therein the stripper-points 16, placing behind them springs 17, by which they are normally but yieldingly held forward, as will be readily understood.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, in a machine for making tubular structures, of the reciprocating internal die or mandrel, a lower die composed of rollers surrounding the opening through which the metal is to be forced the faces whereof form the outside shape of the hollow structure being made, said several rollers being arranged in the same plane with their adjacent edges adapted to operate in close touch with each other, and adjustable supports in which said rollers are mounted, substantially as set forth.

2. The combination, in a machine for making tubular structures, of a reciprocating internal die or mandrel, a lower die composed of rollers surrounding the opening through which the metal is to be forced the faces whereof form the outside shape of the tubular structure being made, said several rollers being arranged in the same plane with their adjacent edges adapted to operate in close touch with each other,whereby a rotary internal die is provided with a practically continuous circular face and adjustable housings wherein said rollers are mounted, whereby an accurate adjustment thereof is provided.

3. The combination, in a machine for making tubular structures, of a reciprocating internal die or mandrel an outer die composed of rollers arranged in the same plane and formed with concave faces set around and bounding the die opening through which metal is to be forced, means for adjusting said rollers, and strippers for removing the tubular structure when formed from the internal die or mandrel.

l. The combination, in a machine for making tubular structures, of a reciprocating internal die or mandrel, a bottom die-plate, housings adj ustably mounted thereon, and rollers framed with concave faces mounted in said housings and forming the lower die through which the metal is forced in being formed in the tubular structure', said several parts being combined, arranged and operating substantially as shown and described.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this y Witnesses:

CHESTER BRADFORD, L. H. CoLvIN. 

